Security advisory for Bugzilla 5.0.3 and 4.4.12

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Security advisory for Bugzilla 5.0.3 and 4.4.12

Frédéric Buclin

Bugzilla is a Web-based bug-tracking system used by a large number of
software projects. The following security issue has been discovered
in Bugzilla:

* A specially crafted bug summary could trigger XSS in dependency graphs.

All affected installations are encouraged to upgrade as soon as

Vulnerability Details

Class:       Cross-Site Scripting
Versions:    Bugzilla 2.16rc1 to 4.4.11, 4.5.1 to 5.0.2
Fixed In:    4.4.12, 5.0.3
Description: Due to an incorrect parsing of the image map generated by the
             dot script, a specially crafted bug summary could trigger XSS
             in dependency graphs.
CVE Number:  CVE-2016-2803

Vulnerability Solutions

The fix for this issue is included in the 4.4.12 and 5.0.3
releases. Upgrading to a release with the relevant fix will
protect your installation from possible exploits of this issue.

If you are unable to upgrade but would like to patch just the security
vulnerability, there are patches available for the issue at the
"References" URL.

Full release downloads, patches to upgrade Bugzilla from previous
versions, and git upgrade instructions are available at:


The Bugzilla team wish to thank the following people for their
assistance in locating, advising us of, and assisting us to fix this

Reporter: Wladimir Palant
Fixed by: Frédéric Buclin, David Lawrence

General information about the Bugzilla bug-tracking system can be found

Comments and follow-ups can be directed to the
newsgroup or the support-bugzilla mailing list. has directions for accessing these

support-bugzilla mailing list
[hidden email]
PLEASE put [hidden email] in the To: field when you reply.

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